MB91F585LC datasheet(39/177 Pages) SPANSION

39 / 177 page

D at aS h ee t

MB91F587LA_DS705-00012-2v0-E, August 22, 2014

CONFIDENTIAL



APPLICATION NOTES

•

Function Switching of a Multiplexed Port

To switch between the port function and the multiplexed pin function, use the PFR (port function register).

However, if a pin is also used for an external bus, its function is switched by the external bus setting. For

details, see "I/O PORTS" in Hardware Manual.

*: MB91F585LB/F586LB/F587LB/F585LD/F586LD/F587LD only

•

Low-power Consumption Mode

To transit to the sleep mode, watch mode, stop mode, watch mode(power-off) or stop mode(power-off),

follow the procedure explained in the "Activating the sleep mode, watch mode, or stop mode" or the

"Activating the watch mode (power-off) or stop mode(power-off)" of "POWER CONSUMPTION

CONTROL" in Hardware Manual.

Take the following notes when using a monitor debugger.

•

Do not set a break point for the low-power consumption transition program.

•

Do not execute an operation step for the low-power consumption transition program.

•

Notes When Writing Data in a Register Having the Status Flag

When writing data in the register that has a status flag (especially, an interrupt request flag) to control

function, take care not to clear its status flag erroneously.

The program must be written not to clear the flag to the status bit, and to set the control bits to have the

desired value.

Especially, if multiple control bits are used, the bit instruction cannot be used. (The bit instruction can

access to a single bit only.) The Byte, Half-word, or Word access must be used to write data in the control

bits and status flag simultaneously. During this time, take care not to clear other bits (in this case, the bits of

status flag) erroneously.

Note: These points can be ignored because the bit instructions already take the points into consideration

for registers that support read-modify-write (RMW) operations. These points must be considered

when using the bit instructions for registers that do not support RMW operations.

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